In 2011 Horia started the year alongside his partner, Robert Lindstedt, at the Brisbane International. They had a good start and reached the final of the tournament but a calf injury of Lindstedt forced them to retire after just one set and thus losing the match in favor of Lukáš Dlouhý / Paul Hanley pair. At the Heineken Open Horia was the defending champion and seeded No. 1 with Robert but they were forced to withdrew due to the Swede's left calf injury sustained just days earlier.

At the Australian Open Horia and Robert were seeds No. 11 but despite leading 1–0 in the first round match against wildcards Colin Ebelthite and Adam Feeney they were forced to retire yet again due to Robert's injury.

After the year's first Grand Slam, Horia decided to give his partner, Robert, time to recover and paired for the PBZ Zagreb Indoors with experienced doubles player, Belgian Dick Norman. This was a successful choice and they reached the tournament final and won it.

Horia Tecău and Bethanie Mattek-Sands from US have won the Australian Open mixed doubles final on the 29th of January.[4] Reached the semifinals in men´s doubles with Robert Lindstedt and lost to Bob and Mike Bryan in a close 3-setter. Reached for the first time a Masters final in Madrid.

Horia Tecău and Robert Lindstedt separated in Sep 2012[5] after a fruitful three years relationship.

Won tournament; or reached Final; Semifinal; Quarter-final; Round 4, 3, 2, 1; competed at a Round Robin stage; lost in Qualification Round; absent from tournament event; played in a Davis Cup - / Fed Cup Zonal Group (with its number indication) or Play-off; won a bronze, silver (F or S) or gold medal at the Olympics; a downgraded Masters Series/1000 tournament (Not a Masters Series); or a tournament that was Not Held in a given year.

To avoid confusion and double counting, these charts are updated either at the conclusion of a tournament, or when the player's participation in the tournament has ended.